Question

section -a
tick the correct option :

1. which of the following is a true solution?

a) chalk in water b) sugar in water c) gel

1. cuboidal epithelium is found in

a) mouth b) bronchises c) food pipe

1. matter has ______ states.

a) 3 b) 5 c) 2

1. which of the following is an element?

a) c b) fes c) h₂

1. a body of mass 50kg is moving with acceleration 2 m/s²

a) 100 n b) 25 n c) 50 n
fill in the blanks :

1. evaporation causes ______
2. ______ connect a bone to muscle.
3. our heart have ______ muscle.
4. odometer of an automobile measures its ______
5. cell was discovered in ______

complete the formulae :

1. force = ______ * acceleration.
2. ______ = mass * velocity
3. v = ______ + at
4. concentration of solution =(mass of ______ / mass of solution )*100
5. 0°c = ______k

classify the following into physical or chemical changes:
melting of icecream, burning of petrol in engine, rolling of chapatti, freezing of water, food
which of the following will show tyndall effect?
salt solution, milk, copper sulphate, starch, air
write the units of following :
force, mass, velocity, momentum, displacement
section -b
one mark questions:

1. 470 k is equal to how many celcius?

2.what does the distance time graph look like for a body in uniform motion?

1. which law explains the recoiling of gun?
2. write three equations of motion.
3. which cell organelle is known as power house of cell?
4. name the tissue that stores fat.
5. what is the boiling point of water?
6. what is the measure of inertia?
7. draw the velocity time graph for a body in non uniform accelerated motion.
8. convert 36 km/h into m/s.

two marks questions:

1. what are characteristics of particles of matter?

Explanation:

Step1: Answer multiple - choice questions

1. A true solution is sugar in water as it forms a homogeneous mixture. So the answer is b.
2. Cuboidal epithelium is found in the mouth. So the answer is a.
3. Matter has 3 states (solid, liquid, gas). So the answer is a.
4. An element is C (carbon), FeS is a compound and H₂ is a molecule. So the answer is a.
5. Using Newton's second law F = ma, where m = 50kg and a=2m/s², F=50×2 = 100N. So the answer is a.

Step2: Fill in the blanks

1. Evaporation causes cooling.
2. Tendon connects a bone to muscle.
3. Our heart have involuntary muscle.
4. Odometer of an automobile measures its distance.
5. Cell was discovered in 1665 by Robert Hooke.

Step3: Complete the formulae

1. Force = mass * acceleration.
2. Momentum = mass * velocity.
3. v = u+at (first equation of motion).
4. Concentration of solution=(Mass of solute / Mass of solution)*100.
5. 0°C = 273K (conversion from Celsius to Kelvin).

Step4: Classify physical or chemical changes

Melting of ice - cream is a physical change, burning of petrol in engine is a chemical change, rolling of chapatti is a physical change, freezing of water is a physical change.

Step5: Identify Tyndall Effect

Milk and starch will show Tyndall effect as they are colloids.

Step6: Write units

Force - Newton (N), Mass - kilogram (kg), Velocity - metre per second (m/s), Momentum - kilogram - metre per second (kg·m/s), Displacement - metre (m).

Step7: One - mark questions

1. To convert Kelvin to Celsius, T(°C)=T(K)-273. So 470K = 470 - 273=197°C.
2. For a body in uniform motion, the distance - time graph is a straight line with a constant slope.
3. The recoil of a gun is explained by Newton's third law of motion.
4. The three equations of motion are v = u+at, s=ut + 0.5at², v²=u² + 2as.
5. Mitochondria is known as the power - house of the cell.
6. Adipose tissue stores fat.
7. The boiling point of water is 100°C or 373K at 1 atm pressure.
8. The measure of inertia is mass.
9. For a body in non - uniform accelerated motion, the velocity - time graph is a curved line.
10. To convert 36 km/h to m/s, 36×(1000/3600)=10m/s.

Step8: Two - mark questions

1. Characteristics of particles of matter: Particles of matter have space between them, they are continuously moving, and they attract each other.

Answer:

1. Multiple - choice:

• 1. b. Sugar in Water
• 2. a. Mouth
• 3. a. 3
• 4. a. C
• 5. a. 100 N

1. Fill in the blanks:

• 1. cooling
• 2. Tendon
• 3. involuntary
• 4. distance
• 5. 1665

1. Complete the formulae:

• 1. mass
• 2. Momentum
• 3. u
• 4. solute
• 5. 273

1. Physical or chemical changes:

• Melting of ice - cream: Physical change
• Burning of petrol in engine: Chemical change
• Rolling of chapatti: Physical change
• Freezing of water: Physical change

1. Tyndall Effect: Milk, Starch
2. Units:

• Force: N
• Mass: kg
• Velocity: m/s
• Momentum: kg·m/s
• Displacement: m

1. One - mark questions:

• 1. 197°C
• 2. Straight line with constant slope
• 3. Newton's third law of motion
• 4. v = u+at, s=ut + 0.5at², v²=u² + 2as
• 5. Mitochondria
• 6. Adipose tissue
• 7. 100°C (or 373K)
• 8. Mass
• 9. Curved line
• 10. 10m/s

1. Two - mark questions:

• 1. Particles of matter have space between them, are continuously moving, and attract each other.